I keep getting these bumps on my knuckles and forearms. I thought they were bedbug bites but they don't appear until about 45 minutes AFTER i wake up.. I was just laying on my bed and realised i had like another 6 on my right forearm! The light was on and everything so i'm sure if it was a bug that is big enough to see, i'd have seen it. They also disapear after a few hours. They don't itch, but when i do scratch them, it feels good. Anybody know? they vary in size, normally about dime size. They are also red, but after a while , sometimes they have no color, and it looks like just a raised bump. Help me please.